tree 2444849ed7c993cf473fc9730ca775707f328a65
parent f20ce4712edf7913aaabe9b722fdc429b8e853a6
author George Mount <mount@google.com> 1459272776 -0700
committer George Mount <mount@google.com> 1459272903 -0700

Ensure window has been added in isTopOfTask

Bug 27893230

When isTopOfTask is called prior to the window being added, it
will throw an IllegalArgumentException. This checks that the
window has been added before making the call.

Change-Id: Idd14c0f1051e16d96a0a1fa9f990f380a1f69911